148 



Appendices to Fourth Annual Report 



CALANIDiE. 



Galanus Jinmarchiciis (Gunner). — A form large enough to be readily 

 recognised without a microscope. It is very abundant in clear water, and 

 is essentially pelagic in its habits. The body is elongated and ovate. 

 Anterior antennae 24-25 jointed, the last two joints having each a long 

 ciliated hair. In the male the hfth pair of feet have the first and second 

 joints of the outer branch greatly elongated, but without any marginal 

 hairs. In the female this pair of feet is not different from the ordinary 

 swimming feet. The terminal spines are long, oval-shaped, and unserrated. 

 The abdomen of the male is five-, that of the female four-jointed, the 

 tail setae being about as long as the abdomen. The colour of this species 

 varies very much, but it is generally yellowish ; it may, however, be of a 

 dark red, and almost pellucid. Though found throughout the year, it is 

 in greatest abundance from May to July. 



Pseudocalanus elongatus (Boeck). — Moderately abundant all through 

 spring, summer, and autumn, both in the open sea and between tide 

 marks. In shape it is very similar to Calanus Jinmarchicus, but of a 

 much smaller size. In the male the anterior antennse have only twenty 

 joints, and the fifth pair of swimming feet are peculiar, the left foot 

 having three, the right five joints ; the abdomen has also five joints. 

 In the female the anterior antennae have twenty-five joints. The fifth 

 pair of swimming feet are absent, and the abdomen has only four joints. 

 In both male and female the caudal segments are very short, and the tail 

 setae scarcely equal to half the length of the abdomen. In colour it is 

 light-red. It occurs in considerable numbers from May to July. 



Metridia armata (Boeck). — Anterior antennae nearly alike in both 

 sexes, each joint bearing on its outer margin one or two short setse. In 

 the male the anterior antennae is twenty-jointed, and hinged between 

 the seventeenth and eighteenth joints. The swimming feet have the 

 inner branch very short and the spines small. Fifth pair of feet cylin- 

 drical, unbranched — in the male four-, in the female three-jointed ; abdo- 

 men of female three-, of male five -jointed ; caudal set^, scarcely half the 

 length of the abdomen ; length, y'g th of an inch (1*6 mm). This copepod 

 was common during the summer. 



Dias lonfjiremis (Lilljeborg). — It is readily recognised by its antennae, 

 on account of their very long hairs, and the swellings at the apeces of the 

 joints. In the male the right anterior antenna has nineteen, the left 

 twenty-one joints, and the fifth pair of feet are four-jointed, and have 

 strong prehensile claws. In the female both antennae are twenty-two 

 jointed, and the fifth feet are small and three-jointed, the terminal joints 

 having long slender claws. The terminal spines of the ordinary swimming 

 feet are long, slender, and sword-shaped, finely serrated on the inner 

 border ; they are peculiar from the fact that they have no small spines at 

 their base connected to the last segment of the foot by a movable hinge, 

 but only an arched process of that segment. This form may be of a 

 yellow or grey colour, or it may be almost transparent. It is common in 

 the spring and early summer. 



Temora longicornis (Miiller). — The body is broad in proportion to its 

 length, and is well rounded off, and generally of a distinct brown colour. 

 The male has twenty-one joints in its anterior antennae, the right limb 

 having a hinge between the eighteenth and nineteenth joints. The right 

 fifth foot consists of a large basal joint, to which are articulated two 

 opposable claws. The left fifth foot is three-jointed, but unbranched. 

 In the female the anterior antennae are twenty-five-jointed, and without 



